High Quality Content by WIKIPEDIA articles! Ambulance is a file infecting computer virus and it does not become memory resident. It will only infect one .COM file in any given directory, but will not infect the first one. This means there must be at least two .COM files in the directory for it to spread. Sometimes when an infected file is executed, an ASCII ambulance can be seen moving across the bottom part of the screen. A siren sound is also played from the systems speaker. Ambulance is not a destructive virus; it simply spreads itself around and shows off its payload once in a while. A computer virus is a computer program that can copy itself and infect a computer. The term "virus" is also commonly but erroneously used to refer to other types of malware, including but not limited to adware and spyware programs that do not have the reproductive ability. A true virus can spread from one computer to another (in some form of executable code) when its host is taken to the target computer; for instance because a user sent it over a network or the Internet, or carried it on a removable medium such as a floppy disk, CD, DVD, or USB drive.

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